Ejecta detection in the middle-aged Galactic supernova remnant G296.1-0.5 observed with Suzaku

TL;DR

This study detects ejecta in the middle-aged supernova remnant G296.1-0.5 using Suzaku X-ray data, revealing elemental abundances and physical parameters consistent with a Sedov phase remnant.

Contribution

First detection of Si emission in G296.1-0.5, providing insights into ejecta composition and remnant evolution in X-ray spectra.

Findings

Ejecta contribution confirmed through enhanced Ne, Mg, Si abundances.

Remnant is in Sedov phase with estimated age ~28,000 years.

Detected Si emission from the remnant for the first time.

Abstract

In this paper, we report the detection of ejecta in the middle-aged Galactic supernova remnant G296.1-0.5 with the X-ray Imaging Spectrometer onboard the Suzaku satellite. The spectra of three lobes, north, southeast and southwest and inter-lobe regions, consist of soft (0.3-2.0 keV) emission originated from non-equilibrium ionization plasma. In north, southeast and inter-lobe regions, the thermal emission can be represented by a one-component, in southwest region it can be represented by two- component non-equilibrium ionization (VNEI) model. The spectra of studied regions have lines of N, O, Ne, Mg and Si elements. Si emission from this remnant is shown for the first time in this work. Enhanced abundances of Ne, Mg and Si elements obtained show the ejecta contribution in all regions. Assuming that the remnant is in Sedov phase, we obtained ambient density n0 ~ 0.45 cm-3, age t ~ 2.8 x 104 yr, shock velocity Vs ~ 320 km s-1, shock temperature Ts ~ 1.2 x 106 K, and swept-up mass Msw ~ 340 M at an adopted distance of d=3 kpc.